eBay

I have paid to a seller for and item.But the item havent received and also the seller is not in ebay.What I have to do to recover my money?

I'm not fresh to ebay purchases(buying).I had linked paypal account with ebay.few weeks ago it was not worked correctly.Today I tried to pay for an item with my debit card(a defferent one).But it was not succeeded and ebay says can't pay with card.Do...